[wpilibc] Move NullDeleter from frc/Base.h to wpi/NullDeleter.h (#3387)

frc/Base.h was also deleted because it's now empty.

wpilibc/src/main/native/include/frc/Base.h

@@ -1,17 +0,0 @@
-// Copyright (c) FIRST and other WPILib contributors.
-// Open Source Software; you can modify and/or share it under the terms of
-// the WPILib BSD license file in the root directory of this project.
-
-#pragma once
-
-/** WPILib FRC namespace */
-namespace frc {
-
-// A struct to use as a deleter when a std::shared_ptr must wrap a raw pointer
-// that is being deleted by someone else.
-template <class T>
-struct NullDeleter {
-  void operator()(T*) const noexcept {};
-};
-
-}  // namespace frc

wpilibc/src/main/native/include/frc/RobotBase.h

@@ -13,7 +13,6 @@
 #include <wpi/mutex.h>
 #include <wpi/raw_ostream.h>
 
-#include "frc/Base.h"
 #include "frc/Errors.h"
 
 namespace frc {